Summary:

This mode gives the player the ability to play as Proto Man (also known as Blues in Japan), who has the "Proto Buster," the ability to slide, and use his "Proto Shield" for defense. However, Proto Man takes twice the damage, has twice the recoil, fires slightly lower shots (he can hit enemies Mega Man would normally miss on the ground) and cannot access Dr. Light's Lab to purchase supplies. There is no story for this version of the game.